Ebay are not helping either.
You can't expect eBay to be helpful. eBay's user agreement explains that all transactions are between you and the seller, not with eBay. They even warn buyers that "they do not guarantee the existence, quality, safety or legality of items advertised, or the truth or accuracy of descriptions". So you can't say you were not warned about the risks of buying here. It isn't like the shops.
eBay does however provide its own money back guarantee, which would have entitled you to a full refund, but claims have to be made within 30 days of delivery.
You might sill be able to get help from your credit or debit card issuer, if that's how you paid. Otherwise you could ask Citizens Advice or a solicitor if it's worthwhile considering the small claims court.